In a confidence interval the finite population correction fa

In a confidence interval, the finite population correction factor (FPCF) can be ignored when:

n = 100 and N = 700.

n = 8 and N = 80.

n = 50 and N = 200.

n = 6 and N = 500.

Solution

it can be ignored when sample size is less than 0.05 of population size.

So is the case with (d) as 6/500 = 0.012 < 0.05